对有序金属间化合物(Fe_(60)Ni_(40))_3(V_(98)Ti_2)的蠕变断裂行为进行了初步研究。用透射电镜观察了稳态蠕变过程中位错亚结构的变化,发现存在大量的堆垛层错和成对位错以及较高密度的位错网络。对断口及近断口剖面的扫描电镜观察指出,晶界上空洞所形成的沿晶断裂是(Fe_(60)Ni_(40))_3(V_(98)Ti_2)蠕变断裂的主要机制。
The creep fracture behaviour of intermetallic compound (Fe_(60)Ni_(40))_3(V_(98)Ti_2) hasbeen studied under 187, 200, 215 and 248 MPa at 923 K. The variation of dislocation substruc-ture is observed with TEM in the process of steady-state creep. It is found that there existsa large amount of stacking faults, dislocation pairs and also high density dislocation networks.SEM analysis of section near fracture surface points out that intergranular crack due to coale-scence of small cavities is the main creep fracture mechanism of intermetallic compound(Fe_(60)Ni_(40))_3(V_(98)Ti_2).
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